Drawing instrument.



. PATENTED MAY 14, 1907.

s. e. STODDARD. 1 DRAWING INSTRUMENT.

AI'PLIOATIQN FILED In 14. 1906.

UNITED STATES PATENT OFFICE.

DRAWING INSTRUMENT.

Specification of Letters Patent.

Patented May 14, 1907.

Application filed May 14.1906. Serial No. 316,591.

To all whom. it may concern:

Be it known that I, SAMUEL G. STODDARD, a citizen of the United States, and a resident of W aterbury, Connecticut, have invented certain new and useful Improvements in Drawing Instruments, of which the following is a specification.

My invention relates to drawing instruments, particularly those adapted to be used for sketching or drawing on the leaf of a book, the sheet of a pad or a separate sheet of paper. Its object is particularly to provide means for making symmetrical drawings,- that is, those which are alike on two sides of a diametric line. i

The further objects of the invention will appear in the specification and be pointed out in the claims.

In the drawings, Figure 1 is the plan view of my device. Fig. 2 is the side elevation of the same. Figs. 3 and 4 are respectively a plan view and the side elevation of an auxiliary tool.

1 designates a clamping device, consisting of a sheet metal sleeve 2, having a horizontally extending portion 3, the tubular portion being slotted at 41.

5 designates a cam-shaped clamp of approximately the length of the portion 8, shown as a segmental rod rotatably engaged in the sleeve portion 2, and having a flat face 6. To the rod 5 is attached a thumb piece or lever 7 which moves in the slot 4. Supported in the present instance at a right angle with the clamping portion 1, is a shaft 8 connected to portion 1 by a short sleeve 9. On the shaft 8 is slidingly mounted a sleeve 10 having a slot 11, through which passes a spring finger 12 bearing on the shaft 8. Extending laterally, and in the present instance at a right angle, from the sleeve 10 is a rule 18, the edges 14 and 15 of which are parallel and similarly graduated. The rule 13 is provided midway of its width with two longitudinal slots 16 and 17, between which is an upstanding rib 18. The independent tool 19 shown in Figs. 3 and 4 of the drawings, is illustrated as a square having" a blade portion 20 and laterally extending flanges 2122, each of which is adapted to engage in either groove 16 or 17 of the rule 13 and to slide with slight friction therein. It is obvious that instead of square 19, a tool of any desired shape or contour may be used.

The operation of the device will be readily understood from an inspection of the drawings. The edge of the leaf of the book or sheet of paper is inserted above the horizontally extending flange 3 of the clamping device and is positively secured by rotating the cam portion 5 so as to firmly clamp the paper therebetween; the shaft 8 being at one side of the sheet of paper on which the drawing is to be made. The rule 13 may be slid on the shaft 8 as desired to draw lines parallel with the clamped edge of the paper. The tool 19 may be inserted in either of the grooves 16 or 17 so that it will project toward or from the clamping device 1. By reason of the similar graduations on each edge of the rule 13, symmetrical figures may be drawn. The function of the flange 18 is to conveniently seat the tool 19 in position in either of the grooves 16 or 17 as desired, and to form a secure abutment for the sliding movement of the tool. The spring finger 12 permits the easy sliding of the rule 18 on the shaft 8 and serves at the same time to hold it in the desired position until voluntarily removed by the operator. It is obvious that certain mechanical changes may be made in my device without departing from my invention.

What I claim is: 1. A drawing instrument comprising .means for clamping the edge of a sheet of paper, a shaft extending approximately at right angle with said clamping means, a rule slidingly mounted on said shaft and extending therefrom approximately parallel with said clamping means, said rule being provided with two longitudinal grooves separated by a vertical rib, and an independent auxiliary tool, as a square or the like, having a later ally extending flange at each side of its blade adapted to engage in either of said grooves.

2. A drawing instrument means for clamping the edge of a sheet of. paper, said means consisting of a cam-shaped clamp and a portion on which the aperis positively secured by said clamp, a s aft extending approximately at a right angle with said clamping means, and a rule slidingly mounted on said shaft and extending therefrom approximately parallel with said clamping means.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

SAMUEL G. STODDARD. Witnesses:

J. H. PILLINe, WILLIAM FOSTER.

comprising 

